In the broader sense, I think this relates to the tragedy of the commons. There are certain societal conventions that tend to make life better on the whole. Keeping traffic to main streets is one of them. Yes, I might gain a minute or two by cutting through your neighborhood, and you might make up a little time cutting through mine. But I don't take that shortcut, because I know it's determintal to the neighborhood and my benefit will be very small. Part of that comes with the expectation that others will in turn do the same for me.
Maybe this is a USAian way of thinking, but I believe that if everyone behaves in the most selfish possible way ("you don't own the street, so you don't get to complain if I use it to save 15 seconds"), life becomes worse for everyone.